A.\(\frac{\pi }{6}rad\)
B.\(\frac{\pi }{3}rad\)
C.\(\frac{{2\pi }}{3}rad\)
D.\(\frac{\pi }{2}rad\)

A.250 m.
B.100 m.
C.150 m.
D.200 m.

A.\(a.\,\,l = 0,6km;\,\,v = 12\,\,km/h;\,\,b.\,\,4\,\,phut\).
B.\(a.\,\,l = 0,6km;\,\,v = 15\,\,km/h;\,\,b.\,\,4\,\,phut\).
C.\(a.\,\,l = 0,75km;\,\,v = 15\,\,km/h;\,\,b.\,\,4,2\,\,phut\).
D.\(a.\,\,l = 0,75km;\,\,v = 12\,\,km/h;\,\,b.\,\,4,2\,\,phut\).

A.9h; 3,2 km.
B.9h 6 phút; 3,2 km.
C.9h 6 phút; 2 km.
D.9h; 2 km.

A.etyl fomat.
B.etyl axetat.
C.metyl fomat.
D.metyl axetat.

A.thiếc.
B.crom.
C.nhôm.
D.kẽm.

A.2
B.3
C.6
D.1

A.Tinh bột.
B.Fructozơ.
C.Saccarozơ.
D.Glucozơ.

A.CH3CH2NH2.
B.H2NCH2COOH.
C.H2NCH(CH3)COOH.
D.HCOONH4.

A.metanol.
B.etanol.
C.etylen glicol.
D.glixerol.